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/*
 * Copyright 2017-2024 noear.org and authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.noear.solon.boot.prop;

import org.noear.solon.Solon;
import org.noear.solon.boot.ServerConstants;
import org.noear.solon.core.handle.Context;

import java.util.HashSet;
import java.util.Set;

/**
 * 静态文件压缩配置
 *
 * @author noear
 * @since 2.5
 */
public class GzipProps {
    private static boolean enable = false;
    private static long minSize = 4096;
    private static Set mimeTypes = new HashSet<>();

    static {
        mimeTypes.add("text/html");
        mimeTypes.add("text/xml");
        mimeTypes.add("text/plain");
        mimeTypes.add("text/css");
        mimeTypes.add("text/javascript");
        mimeTypes.add("application/javascript");
        mimeTypes.add("application/xml");

        load();
    }

    /**
     * 是否启用
     */
    public static boolean enable() {
        return enable;
    }

    /**
     * 最小大小
     */
    public static long minSize() {
        return minSize;
    }

    /**
     * 设置是否启用
     */
    public static void enable(boolean enable) {
        GzipProps.enable = enable;
    }

    /**
     * 设置最小大小
     */
    public static void minSize(long minSize) {
        GzipProps.minSize = minSize;
    }

    /**
     * 添加 mime
     */
    public static void mimeAdd(String mime) {
        mimeTypes.add(mime);
    }

    /**
     * 移除 mime
     */
    public static void mimeRemove(String mime) {
        mimeTypes.remove(mime);
    }

    /**
     * 加载配置
     */
    public static void load() {
        if (Solon.app() == null) {
            return;
        }

        enable = Solon.cfg().getBool(ServerConstants.SERVER_HTTP_GZIP_ENABLE, false);
        minSize = Solon.cfg().getLong(ServerConstants.SERVER_HTTP_GZIP_MINSIZE, 4096);
        Solon.cfg().getMap(ServerConstants.SERVER_HTTP_GZIP_MIMETYPES).forEach((key, val) -> {
            for (String mime : val.split(",")) {
                mimeTypes.add(mime);
            }
        });
    }

    /**
     * 配置需要 gzip
     */
    public static boolean requiredGzip(Context ctx, String contentType, long size) {
        if (enable && size >= minSize) {
            String ae = ctx.header("Accept-Encoding");
            if (ae != null && ae.contains("gzip") && mimeTypes.contains(resolveMime(contentType))) {
                return true;
            }
        }

        return false;
    }

    /**
     * 配置包函 mime
     */
    public static boolean hasMime(String contentType) {
        if (enable) {
            return mimeTypes.contains(resolveMime(contentType));
        }

        return false;
    }

    /**
     * 分析 mime
     *
     * @param contentType 内容类型
     * @return mime
     */
    public static String resolveMime(String contentType) {
        int idx = contentType.indexOf(';');
        if (idx > 0) {
            return contentType.substring(0, idx);
        } else {
            return contentType;
        }
    }
}